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The name servers are prioritized in the order the system finds them in the file.
Solution DHCP servers have the ability to send dynamic DNS updates, as they allocate IPs to clients.
Normally what happens is that the (remote) DHCP server provides to Network Manager both an IP address for the local interface and the address of a (remote) DNS nameserver to use.
Network Manager starts an instance of a forwarding nameserver that listens locally at 127.0.1.1.
On most Linux operating systems, the DNS servers that the system uses for name resolution are defined in the /etc/file.
That file should contain at least one line defines a DNS server.
If it is, then your client is caching DNS and you can flush it with this: sudo /etc/init.d/nscd restart if NSCD is not running then there is nothing to flush on the client and you need to: 1.